<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <span v-if="isShow">现在你看到我了</span>
    </div>
    
</body>
</html>
<script src="../js/vue.js"></script>
<script>
    var app = new Vue({
        el: "#app",
        data: {
            isShow: true
        }
    })
</script>